Cadillac 2010 DTS Owner's Manual page 194

•
Your vehicle is loaded such that the front end of the
vehicle points upward, causing the IntelliBeam
sensor to aim high and not detect headlamps and
taillamps.
•
You are driving on winding or hilly roads.
You might need to manually disable or cancel the
high-beam headlamps by turning the low-beam
headlamps on, if any of the above conditions exist.
Disabling and Resetting IntelliBeam™ at
the Rearview Mirror
IntelliBeam can be disabled by using the controls on the
inside rearview mirror.
AUTO 3 (On/Off): Press this button on the inside
rearview mirror to disable the system. The IntelliBeam
indicator turns off and does not come back on until
the IntelliBeam button is pressed again.
When IntelliBeam has turned on the high-beams, pull or
push the high-beam stalk. This will disable IntelliBeam.
The IntelliBeam indicator on the mirror turns off. To
turn IntelliBeam back on, press the IntelliBeam button
on the mirror.
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A different sensitivity setting is available for
dealer/retailer diagnostics. This is done by pushing and
holding this button for 20 seconds until the IntelliBeam
indicator light flashes three times. If you accidentally
activate this, the vehicle' s setting automatically is reset
when the ignition is turned off and then on again.
Cleaning the IntelliBeam™ Light Sensor
Clean the light sensor window, periodically, using glass
cleaner on a soft cloth. Gently wipe the sensor
window. Do not spray glass cleaner directly on the
surface of the sensor window.
The light sensor is located
on the inside of the vehicle
in front of the inside
rearview mirror.